The invention discloses a pumped storage power station working condition conversion optimization method. The method comprises the steps of performing backup of working condition conversion data basedon timing snapshots and non-timing snapshots; in response to the abnormality of the pumped storage power station system after working condition conversion, extracting backup working condition conversion data, performing abnormality analysis, and modifying the working condition conversion step according to an abnormality analysis result; and in response to the fact that the pumped storage power station system after working condition conversion is normal and does not reach the optimal state, extracting backup working condition conversion data, performing optimization analysis, and modifying theworking condition conversion step according to an optimization analysis result. The invention further discloses a corresponding system. According to the method, a timing snapshot and non-timing snapshot combined method is adopted, equipment parameters changed in the system working condition conversion process are backed up, abnormality and optimization analysis is conducted according to the equipment parameters, the working condition conversion steps are modified according to the analysis result, and finally the optimal conversion step is obtained.